const arr = [];
// const arr1 = new Array();
const arr2 = new Array(5).fill(new Array(5).fill(0));

console.log(arr2);
console.log(arr2.length);

for(let i = 0; i < arr2.length; i++) {
  for(let j = 0; j < arr2[i].length; j++) {
    if(i ===0 && j === 0) {
      arr2[i][j] = 1;
    }
  }
}
console.log(arr2);

